.all {
    width: 1000px;
    height: 400px;
    background-color: white;
    margin: 100px auto;
    position: relative;
}

.left {
    width: 123px;
    height: 225px;
    background-color: black;
    color: white;
    font-size: 20px;
    float: left;
    position: relative;
}

.left_item {
    margin: 4px;
}

.reight {
    width: 400px;
    height: 225px;
    float: left;
    overflow: hidden;
    position: relative;
}

.img {
    position: relative;
}

.b {
    width: 100%;
    position: absolute;
}

.dots {
    width: 100%;
    height: 20px;
    position: absolute;
    bottom: 0;
    display: flex;
    justify-content: center;
}

.dot {
    width: 10px;
    height: 10px;
    background-color: rgb(126 122 122);
    ;
    border-radius: 50%;
    margin-right: 5px;
}

.dot.active {
    background-color: blue;
}

.xiangzuo {
    color: #fff;
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: #00000052;
    left: 10px;
    top: 50%;
    transform: rotate(180deg) translateY(50%);
    z-index: 2;
}

.xiangyou {
    color: #fff;
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: #00000052;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}